Gas rock-drill.



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ATTORNEY INVENTOI? M J4 g 261% J. v. YRIGE, JR.

GAS ROCK DRILL. APPLICATION FILED 0013.8, 1900.

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moms) PATENTED DEC. 12, 1905? PATENTBD DEG. 12,1905.

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INVENTOI? ATTORNEY No. 807,399. v

' J. V. RICE, JR. GAS ROCK DRILL. APPLICATION FILED 001'. s, 1900.

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'No. 807,399. v PATENTED DEC. 12; 1905.

'J. V. RICE, J11, I GAS ROCK DRILL.

APPLICATION FILED OUT. 8, 1900.

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llllllllllllllllx IIIIIIIIII/ WITNESSES I INVENTOI? UNI ED s A ns PATENT OFFIGE.

JOHN V. RICE, JR., OF EDGEWATER PARK, NEW JERSEY.

GAS ROCK-DRILL. I i

To all whom it may concern:

Be it known that I, J OHN V. RICE, J r. a citizen of the United States, residing at Edge water Park, in the'county of Burlington and State of New Jersey, have invented certain new and useful Improvements in Gas Rock- Drills, of which the following is a specification.

My present invention relates to an improvement in rock-drills, and more particularly to that subdivision ofthe general class intended primarily to be actuated by a 'gas or other explosive mixture.

The principal object I have in view in my present improvements is to secure greater compactness in the arrangement of the parts of" the drill set forth in 'my copending application for Letters Patent, filed May 20, 1899, Serial No. 717,565, to which reference is here made, while other objects are to improve the general operation and achieve simplicity, cheapness, and durability; and the invention therefore consists, essentially, in the construction and combination of parts. substantially as will be described and claimed.

In the annexed drawings, Figure 1 is a horizontal sectional plan view of my improve gas-actuated rock-drill. Fig. 2 is a sectional side elevation ofv the same. Fig. 3 is a transversesection on the line y 3 of Fig. 1, certain parts being removed. Fig. 4 is a transverse section on the line as w of Fig. 1, certain parts being removed. Fig. 5 is a right-hand end elevation. Fig.6 is a partial sectional side elevation taken from the side opposite to that shown in Fig. 2.

Like numerals of reference denote like parts in all the different figures.

1 denotes the main cylinder, surrounded by 3. that is secured at its inner 'end to the inner block 4, that is movable within the piston 40 and serves as a part ofthe elastic connection between the piston and piston-rod.

In further explanation of the'precise form of cushion connection herein explained for the piston and its red it may be said the Specification of Letters Patent. Application filed Gotoher 8, 1900. Serial No. 32,360.

Patented Dec. 12, 1905.

piston-rod 3 has an axial passage 7, that receives air through some suitable inlet-port and allows said air to pass to the block 4, from which it is discharged into the right-hand end of the interior of piston 40 through the valve forth, so that the requisite amount of cushioning air may be supplied to the interior of the hollow piston 40 at the left-hand end of block 4.

On the piston 40 is secured across-head 13, i

in which travels a crank-pin 14 on the crank arm 15, that is secured to or made a part of the crank-shaft 16, carrying the fly-wheel 17. Shaft 16 is properly supported in hearings in the main frame.

Parallel to the crank-shaft 16 another shaft 20 is supported in suitable bearings in the motor-frame, and on this are two cams 21 and 22 and an eccentric 23. Likewiseon shaft 20 is a gear-wheel 19, that is engaged and driven by a pinion 18 on crank-shaft 16. The eccentric 23 actuates an eccentric-rod 24, whose opposite extremity is pivoted at 34 (see Fig. 3) to the lower end of an arm 33, connected to a revoluble pin 35, carrying at one end an electrode 38, which contacts with the oscillating electrode 39 in sparking. The end of pin 35 that connects with arm 33 is screw-threaded, and thereon is a nut 37, pressing against a spring 36, and in this way holding the electrode 38 tightly in place,as well as so keeping the pin 35 in place as not to allow any leakage through its bearings.

The passage 9,'leading from the explosionchamber 1*, both conveys the explosive mixture to said chamber and also disposes of the equipped with a spring 42, that is tensioned between a nut 44 and the'valve-casing, and this spring acts normally to keep the valve closed. A short rod 26 playsthrougha bea r' ing in a part 45 of the main frame and has one end against the nut 43, while the other end is acted on by the cam 22. Another similar rod has one end against nut 44, while the other end is acted on by the cam 21, and thus it will be seen that the earns 21 and 22 control the opening of the valves 28 and 31.

The operation of the apparatus may; now be described. The internal-combustion engine which operates to drive the drill is not different in its principle of operation from an ordinary, four-cycle engine. The combustion of the charge of gas or vapor mixed with air in the chamber 1 in rear of the piston causes the latter to reciprocate, and the reciprocation of the piston in turn through the crosshead 13, the crank 14, the shaft 16, and the connected gearing operates the valves and the igniter to cause successive charges of gas and air to be admitted to the cylinder and fired and to allow the escapeof the products of combustion in a well-known manner. As

the piston reciprocates its motion is imparted to the piston-rod, the connection between the two, however, being elastic. It will be understood that .the valves 5 and 6 operate au tomatically to admit suflicient quantities of air into the chambers on either side of the valves controlled by the cams of said shaft.

2. The combination with the main cylinder having at one end an explosion-chamber, of a hollow, elongated piston provided with an elastically-connected piston-rod, and provided also with an automatic check-valve for admitting air automatically to the interior of the piston, and the gas inlet-and exhaust outlet vlalves together with means for operating t em.

3. The combination of the main cylinder, a

ceases in the'piston having an air-valve, a piston-rod provided with a longitudinalair-passage there- 1 cross-head on the piston, a crank-shaft, and

the gas inlet and exhaust outlet valves.

5. The combination of the cylinder, its hollow piston, a piston-rod, a sliding block within.

the piston to which thepiston-rod is attached,

said sliding block having an air-valve controlling the passage of air throughthe pistonrod into the piston at one side of-the sliding block, an air inlet valve on the wallof the pistonfor admitting air automatically to the other; side of the sliding block, and the gas inlet and exhaust outlet valves together with means for operating them.

6. The combination of the cylinder, a piston therein, a piston-rod, a sliding blockv within the piston to which the piston-rod is attached, a valve in the sliding block controlling the delivery of air through a passage in the pistonrod into the piston at one side of the sliding block, and means on the wall of the piston for admitting air automatically to the' other side of the sliding block.

7 The combination with the main cylinder having at one end an explosion-chamber,of a hollow elongated piston therein, a piston-rod having an air-passage, means for yieldingly.

connecting the piston-rod to the piston consisting of a sliding block within the piston and on theend of the piston-rod, a valve in the sliding block for controlling the delivery of air which comes through the piston-rod at one side of the block, and means on the wall of the piston for automatically admitting air to the other side of the block, a crank-shaft, means connecting said shaft with the piston,

and the gas inlet and exhaust valves together I with means for operating them.

In testimony whereof I affix my signature in presence of two witnesses.

' JOHN V. RICE, JR. Witnesses:

WILLIAM J. DIoKsoN, FRED E. TASKER.

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